I've had the same notification tone for texts for about 5 years now. It's a cougar growl/roar. Nobody else has it that I know, so I know it's definitely my phone that went off. Also it's funny to see the reactions of people when they hear it go off lol. Always along the lines of "there's a cougar in your pants!"
Locked | ROM: Rootbox 4.2.2 | Kernel: Stock
Locked | S-Off | ROM: Infection 2.9.1 | Kernel: Stock | Radio: 1.22.10.0421r/1.22.10.0424r | HBOOT: Stock 2.25
S-Off | CM9.0.0 (Unofficial) | Kernel: stock | Radio: 2.15.10.07.07 |